package com.changgou.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpCookie;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

    //令牌头名字
    private static final String AUTHORIZE_TOKEN = "Authorization";

    /**
     * 全局过滤器
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取Request、Response 对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //获取请求的URI
        String path = request.getURI().getPath();

        //如果是登录、goods的动开放的微服务[这里的goods部分开放],则直接方形，这里不做完整演示
        /*if(path.startsWith("/api/user/login") || path.startsWith("/api/brand/search/") ){
            //放行
            Mono<Void> filter =  chain.filter(exchange);
            return filter;
        }*/
        if(URLFilter.hasAuthorrize(path)){
            Mono<Void> filter = chain.filter(exchange);
            return filter;
        }
        
        
        //获取头文件中的令牌信息
        String tokent = request.getHeaders().getFirst(AUTHORIZE_TOKEN);
        if(StringUtils.isEmpty(tokent)){
            tokent = request.getQueryParams().getFirst(AUTHORIZE_TOKEN);
        }

        //从cookie中获取令牌数据
        HttpCookie httpCookie = request.getCookies().getFirst(AUTHORIZE_TOKEN);
        if(httpCookie!=null){
            tokent = httpCookie.getValue();
        }


        if(StringUtils.isEmpty(tokent)){
            //设置方法不允许被访问 405
            response.setStatusCode(HttpStatus.METHOD_NOT_ALLOWED);
            return response.setComplete();
        }

        //解析令牌数据
        try {
            //Claims claims = JwtUtil.parseJWT(tokent);
            request.mutate().header(AUTHORIZE_TOKEN,"Bearer "+tokent);
        }catch (Exception e){
            e.printStackTrace();
            //解析失败 响应401错误
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //放行
        return  chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
